How do I add more categories to Mac OS X Finder's sidebar?

My Finder sidebar has two categories: Favorites and Devices. How do I add more categories?

Solution 1:

It's not possible to add more categories (see picture). There are:

• Favorites:

  • For any subdirectory of the root directory
  • You can add custom links to folders (not files) via drag and drop
  • custom searches

• Shared:

  • Local Network, Servers, Back to my Mac, Time Capsule,...

• Devices:

  • Harddrives (internal/external), other storage media like CDs, devices like iPhones

However, there is a workaround which allows to add separators and changing icons.

Download the icons here.

Solution 2:

You can add a folder to favorites by simple clicking and dragging. Or, select the folder and press command+T